The concept of the Biodome is great, but the execution is faulty...I really thought it would be bigger.
The Biodome is marketed somewhat as a Zoo, it's just not what I expected after visiting many quality Zoo's elsewhere. I mean, you can literally walk this place in an hour, which includes stopping and taking pictures of elusive animals, and yet it costs $17 per person. The limited engagement at a high price yields a lower rating. However, I do agree that for Montreal it's nice for some because there is nothing else like it around. Perhaps if I had children I'd be more inclined to return.
It really is easy to get to, as it's located right outside the Viau metro stop on the green line In the old olympic village. You can group your tickets to other attractions for a slight discount, for example you can add the olympic tower for an extra $10 per person.
At the end of the day, I can think of better things to do with $60 instead of 2 hours for 2 people in the old olympic village in Montreal.